Heater.



HARRY n. REDEKER, or RUPERT, IDAHb. y

HEATER.

To all whom t may coa/:ern

Be it known that I, HARRY E. REDEKER, a citizen of the United States, and a resi# dent of Rupert, invthe' county ot Minidola and State of Idaho, have inventeda neu7 -and useful Improvement in Heaters, of

which the following is a specification.

My invention is'an improvement `in heat` ers, andthe invention `has for its object to provide a heater especially adapted for lab-y oratory use, wherein a heater casing is provided of truste-conical form and arranged `with its large end downward and provided with axial o enings in its ends for the. admission an departure of air, the casing having a heating coil'support'ed near its side wall and having a switch below the casj ing for controlling the flow of current to the coil, and wherein a supporting lsleeve is' provided shaped at one end to t aroundthe upper-fend of the casing and having flaring lugs at the otherfend for-receiving a bealrer or'the likepand -wherein a series of attach- ,ments is provided, cacli,adapted to seat within the sleeve upon the easing, and each having a cylindrical extension fitting within the opening at the upper end of the`casing.

A further object is to lprovide a series of attachments designed to permit the heater to be used in a number of different operations in the laboratory, as for instance, Jfor heating test tubes, beakers; evaporating dishes, distilling asks, reduction tests, digestion and distilling operations, and in combined straight and steam (distillation, merely by changing the attachments.`

In the drawings :-Figure l is a perspective view of the improved heater in use in combined straight and steam distillation, Fig. 2 is a vertical section through the heater with the water heater and steam attachment in place, Fig. f3 is a section on the line 3-3 of Fig. Q, looking in the direction of the arrow adjacent to the line, Fig. 4 is a perspective view of one of the supports for the heating coil, Fig. 5 is a perspective view of the attachment for permitting the heating of test tubes, Fig. 6 is a similar view of the bealrer heater attachment, Fig. 7 is a similar view of a modified arrangement for the same purpose, Fig. 8 is a perspective view ot the heater in use with the reduction apparatus, Fig. 9 is a diagrammatic view of the wiringxfor the heating coil, Fig. 10 is Specification of'Leitters Patent.

Patented Ort l. 1916.

Application fue@ March 27, i916. seriali-N0. 86,995.

an enlarged section of a modi/edform of heating coil support, and Fig. 1l is a partial sectional view of the support shown in F1g.10.

In the embodiment of the invention shown in Figs. 2v and 3, the heater pi'operplate 2, the said. plates being connected by series of rods 3, and the ysaid rods are preferably of shaft steel. 'Each rodv as shown in Fig. 10, is reduced at its lower end, and/passed through an openingr` in `the lower plate 2, the rod being headed below the plate as indicatedat il. The upper end is composed of an upper. plate 1 and a lower of each rod is threaded and each rod is.

passed` at itsl upper end through an opening inthe plate l, and nuts' and are threaded to each rod above and below the plate. The

rods in the present instancel are five in number and they are spaced 'apart lat'equal distances frorneach other, and each rod supports a heating coil support' of insulating material, preferably from clay, which when ,baked will withstand a high degilee of heat lower ends on the upper face of the sheet and at their upper ends aga-inst the lock nuts 6. The lock nuts 6 are turned down just far enough to touch the upper ends of the 'tubular supports 8, but. are not tightened, since the unequal expanding and contracting due to heating and cooling might injure the supports ofthe heating coil were they ,clamped tightly betweenvthe nut and the lower plate 2. -Each of these tubes or vsupports 8 has a longitudinally extending openino' 9, through which a rod 3 passes, and it will be noticed from an inspection of Figs. 3 and at that the said' supports are oblong in cross section, the opening 9 being eccentric or nearer one end of the long axis of the cross section than the other. l

Eachsupport is notched horizontally at spaced intervals as indicated at l0 at the end of the longl cross 'sectional axis remote The lower plate 2 is larger than the upper plate, and the heater proper is completed vby a body in the form of a truste-conical sleeve 12, which fits outside the plates l and 2. A lining 13.0 asbestos is arranged 'on the inner face of the body, and legs 14 sup- V.port the body, each leg being connected at betweenthe lower plate 2 and the base 16. i'

Thevupper and lower plates and connected parts and the body 12 of the heater are thus held in proper spaced relation by the legs 14, the bolts 17, and the knobs 18. The base 1G is preferably'provided with legs at 'its corners in the form of screws 19, the said screws .serving also to connect the legs 14 at their lower endsjwith .the base. The screws are passed through the legs and through the base and are of a length to extend below the base to 'space the base above the support upon which itrests'as shown in Fig. 2.

A switch plate or board 20 is supported between -tlie-.base and the plate 2, the said plate being approximately triangular and having its base outward. A binding post 21 isarranged at the apex of the plate, and a switch lever 22 is pivoted to the binding post. vr A second binding post 23 is connected lwith the left hand corner of the switch plate,

andthe lead wires 24 and 25 from the source of'current, in the present instance, a battery 26"are connected with the binding posts 21 and v A Centact buttons27, 28 and 29 are arranged inline with the binding post 23 and a line thrbgh the said binding Vpost and Contact" buttons is parallel with the base of the switch plate. lead wire 30 connects the binding post 23 with one end of the coil l1, the upper end, in the present instance, and a second lead wire, connects the other end of the coil,- the lower end in the present instance with the .contact button 28. A third lead wire 32 leads from the contact button, 29 to the center of the coil, and it is obvious that when the switch lever 22 is in the position loi Fig.vl 9 the current will flow by way pf the lead' wires 25 and 30 through half the coil, returning by way of the lead' wire 32, the switch lever, and the lead wire 24. When the switclr lever is on the button 28. the current will Aflow by way of the lead wires 25 vand 30, through all the coil,returning by way of the lead wire 31, the switch lever 32 and the lead wire 24. `When the `switch vlever is on the button 27 the current isinterrupted. lt will be understood that lin practice the heater will receive current from a lighting circuit.

riihe upper plate 1 of the heater is provided with acentral opening 33, and *the lower In operation the conducting wires 24 and 25 are connected with for instance, a l11() volt A. C. circuit by means of a plug and the switch `lever is thrown into the position shown-in Fig. 9 in order that the heater may heat quickly. After the required degree of heat has been attained the switch lever may be moved-to the plug 28, if desired. The air within the inclo'sing casing of the heater is heated by the coil and rises upward passing out through the opening 33. Cold air enters through the opening 34 to replace the heated air and is in turn heated. `When it is. .de sired vto heat beakers, the disk 35 shown in Fig. 6 is usedor the disk 36 shown in Fig. 7

or both may be used if desired, one being arranged above the other. These disks are of a size t'o tit over the upper plate l of the heater body, andit is obvious that the uprising heated air will heat the disks 35 and 36. The disk 35 is provided with openings 37 arranged in annular series near its periphery andthe disk 36 is of perforatematerial. A Hat bottomed object, as for instance, albeaker, when placed upon the heater ireceives the heat as from the ordinary heated plate and in addition receives an upward currentl of hot air. l

In Fig. 5 a test vtube heater is shown, the said heater consisting of a ring 38, having a depending flange 39 vat its outer edge and opening of the ring and is flanged outwardly as lindicated at 4labove the ring. The lower end of the cylindrical body is closed, and the side wall thereof is provided with perfocal body 40 is inserted in the opening 33, with the flange 39 of the ring 33 resting upon the upper ends of the rod 3 and with the flange 39 depending outside of the rods. The test` tubes are placed in the cylindrical body, and it is obvious that the heated air gill pass through the perforat-ions 42v into Contact with the test tubes, and they will also be heated directly from the heating of the cylindrical body and. the ring.

` rations as shown at 42. In usevthe cylindri In Fig. 2 a water heater and steam gener- 1 ator is shown, the said heater and generator comprising a cylindrical body 43, having at one end a-head 44 provided with a `central filling nipple 45, which may be'4 closed by a .y centering the same.

- tilling flasks -to vbe heated. This 'ring as shown, is slitted from both its upper and v'lower edges, the slits of one series alternating with the slits of the other series, and the slits are rou'nded'asshown. The tongues 54 formed at the upper edge between rthe slits heater. when a hauling naakte reused,

ment' of supporting the heating coil.

are bent outward in rounding form as shown, while the tongues 55 formed at the' lower edge in the saine manner are bent angular-ly outward to' lit around the body l2 of the as shown in Fig. l, it may be seated' directly within the tongues 54. i

In Fig. 8 a reduction apparatus is shown, the said apparatus Consisting of a sleeve 57 of'a size to tit around the body 12 of the heater and to extend at'its lower edge to about the vertical center of the body. A The upper end of the sleeve 57 is attened on one axis as shown into elliptical form and the said-upper edge is notched as indicate'd at 58 at the ends of the long axis of the said end. The tube 59 containing material to be l casing 4arranged with its large end downreduced is held in the notches 58, as shown.

In Fig. 1l is shown a'modifled arrange-- In Fig. 2 the coil is supported within 'the notches 10, while in Fig. l1 the coil 60 is supported by an asbestos cord 61, the said cord being arranged in coils alternating with the coils of the 'heating coil. The porcelainitubes 62 constituting the supports vcor responding to the tubes 8 for the coil 11 are fitted on rods 63, connected with the upper h and vlower plates la and 2a in the same man- 'ner as the rods 3 are connected with. the

The last-named cylinder' 52-f I claim.:-v y l. A heater Vcomprising a frusto-conical casing arranged with its large end downward and provided with a lining of lno nheat conducting material on its side wall and base, and having axial openings in its top Y and base for the passage of air, a series of insulating` supports arranged in annular form nearthe sidewall, a heating coil supported by the supports, a switch below the base for controlling the flow of current to the coi1,a` sleeve having one end shaped to lit around the upper end of the heater and havingl'outwardly bentlugs at its upper end, andan attachment for use with the heater vand adapted to seat, upon the top thereof within the sleeve,` `the attachment having a y cylindricalextension at the center of its bottom tting within the opening of the top of the heater.v Y l 2. `A heater comprising a; frusto-conical casing arrangedv with itsl .large end downward and having 'axial openings in its top and base for the l'passage ofv air, a series of insulating supports arranged 1n annular form near the-'side wall, a heating coil sup ported by the supports, a switch below the base `for controllingtheow of current to the coil, a sleeve 'having one end shaped to it around the upper end ofl the heater and lhaving outwardly bent lugs at its upper end,

and an attachment for use' with the heater and vadapted to seat upontheftop thereof within the sleeve.v v

3. A heater comprising a Vfrusto-conieal ward and having axial openings in top and base for the passage of air, a .seriesjo insulating supports arranged 4in annular form near thev side wall', a heating coil supiy ported by the supports, and a switch below the base for controlling the ow 'of current 'to the coil.

4, A heater comprising `a trusto-.conic'al f casing arranged with its' small end upward and having axial openings in its top and bottom, a'heating ,element within the cas# .I

ing, means for controlling 4the ow of current to the element and a sleeve for 'l supporting articles to be heated fitting around the top of the' Ac asiing and extending above the same and having means for .supporting the articles to be'heated. v

' HARRY E. REDEKER; 

